I have a Marbles brass bead sight on my Uberti 1873. I don't remember the exact height or the size of the bead, but Marbles offers a variety. I chose a smaller bead for a finer sight picture. I assume that the Miroku '73s use a standard dovetail.

CC Griff

EDIT: Through the miracle of Brownells' order history section (from 2012), I found the exact front sight that I have:

I like the size of the gold bead on the Winchester/Miroku, but - it's NOT my rifle! My wife finds it too small for her liking.

The bead on her Marlin 94 .357 is slightly larger and that is what she wants to duplicate. I think the Pioneer .093 will do. I'm surprised that it is not a tapered dovetail like the Lyman, but a straight base.